Mizuno Prospect Series uses full grain pigskin leather, providing great durability, enhanced softness, and Mizuno’s innovative easy close technologies, making catching easy. All to help your Prospect learn to love the game. Full Grain Pigskin Leather: For great durability. ButterSoft Palm Liner: PU palm lining for increased durability, feel, and comfort. MZO Lining: Disperses perspiration away from the skin.